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It does not make sense that a rear defrost is required because not all cars have a rear defrost. Your legal requirement is to have clear rear vision. Which can be done with two side mirrors and the rear enclosed, ie. a van. Or scrape the window like the other hundreds of vehicles that don't...

More efficient? Interesting....I'm no scientist but I would bet gravity downward flow is more efficient than gravity horizontal flow. I believe a horizontal flow requires the coolant to be "pushed" slightly, which would be less efficient. As for cooling the coolant, that is dependent on the...